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postgres-lambda-diff

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    Tom Lane authored
    per-tuple space overhead for sorts in memory.  I chose to replace the
    previous patch that tried to write out the bare minimum amount of data
    when sorting on disk; instead, just dump the MinimalTuples as-is.  This
    wastes 3 to 10 bytes per tuple depending on architecture and null-bitmap
    length, but the simplification in the writetup/readtup routines seems
    worth it.
    cdd5178c
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